University of California

Certain water relations of the genus Prunus


Arthur H. Hendrickson

Publication Information

Hilgardia 1(19):479-524. DOI:10.3733/hilg.v01n19p479. June 1926.

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This paper is based on a comparative study of stomatal behavior and moisture content of trees of the genus Prunus during the rainless summer months in California, where they are grown under conditions of both abundant and scanty soil moisture.

The behavior of stomata in relation to transpiration has been a riddle to physiologists. Lloyd,(15)-(16) working with Fauquiera splendens in Arizona, first stated that the regulatory effect of stomata on transpiration was almost nil. Later he modified this view and showed that transpirational losses followed stomatal opening. Other physiologists thought that, except for the small water loss due to cuticular transpiration, the stomata controlled the transpirational losses. Francis Darwin,(3) Knight,(10)-(11) and others studied the action of stomata by means of the porometer. This device consisted of a hollow receptacle fastened to the leaf, through which a stream of air was drawn. From the amount of air which could be drawn through a leaf under carefully controlled conditions, these workers drew their conclusions regarding the transpiration of the plant. The value of this method was problematical and Darwin and Pertz(4) stated that “it is not certain that we shall ever be able to deduce the size of stomata from readings of the porometer.”

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Hendrickson A. 1926. Certain water relations of the genus Prunus. Hilgardia 1(19):479-524. DOI:10.3733/hilg.v01n19p479
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